(b)
Percentage of
carbon dioxide
in the Earth's
atmosphere
80
60
40
20
0
3
2
Billions of years ago
0
Present
day
The mass of gas in Earth's atmosphere remains constant at 5.15 x 10 18 kg
Determine the maximum mass of carbon dioxide that was in the Earth's atmosphere.
Use the graph above.

b Percentage of carbon dioxide in the Earths atmosphere 80 60 40 20 0 3 2 Billions of years ago 0 Present day The mass of gas in Earths atmosphere remains const class=